Because if you fail to do so you could be
sinning by deliberately keeping yourself ignorant. It's a big sin
in Islam. Even if other religions regard it as a virtue they are
wrong and God will take you to account for not making proper use
of the mind He gave you.

Why haven't you done so yet?

Could it be that you have only ever got
your information about Islam from the sensationalist media?
Well maybe it's time to take your information from somewhere
else.

Could it be that you simply can't be
bothered to look into religion? Well maybe you are
just generalising your negative impressions of religion
without any good justification. All religions are not the
same.

If you have any interest in the future of
this planet you should find out about Islam. Islam is not only
the fastest growing religion in the world but is now also the
second largest religion in Europe and in the USA. Islam is
the only serious alternative to the current amoral ideologies
dominating the current world 'order' and it is to those who know
about it the
strongest moral force on Earth.